Fuel injection pump



Feb, 1, 1938.

H. A. MENTELE 2,107,079

FUEL INJECTION PUMP Filed Dec. 22, 1936 3 Sheets-Sheet l /Z- V, ,00 -/a/ vv i 77- 'l W if Inventor www Feb. 1, 1938. A MEN-TELE '2,107,079 n FUEL INJECTION PUMP Filed Dec. 22 1956 3 Sheets-Sheet 2 By @Mw/22W www 15a/m Attorneys Y Feb. 1, 1938.

H. A. MENTELE 2,107,079 n Filed Dec. 22, 1956 3 Sheets-Sheet 5 I Patented Feb. l, 1938 UNITED STATES PATENT OFFICE INJECTION PUMP Hebert A. Mehrere, Caneva, s. nek.l

Anpueeaen December 22, 1936, serial Ne. 117,202

'I'his invention generically relates to internal combustion engines, and more especially to a mechanism or pump for injecting fuel under the requisite working pressure into ders of an internal combustion the power cylinengine; and the invention together with" its objects and advantages will be best understood from 'a study of the following description taken in connection with the accompanying drawingsrwhereinz- Figure 1 is an enlarged vertical sectional view through the injection pump.

Figure 2 is a transverse sectional view illustrating certain details hereinafter .more fully referred to.

Figure 31s a fragmentary detail view partly in section and partly in elevation showing a cam assembly for adjusting the strokesof the individual pumping units.

Figure 4 is an elevational view of a shaft hereinafter more fully referred to.

Figure 5 is a plan view of a shaft hereinafter more fully referred to.

Figure 6 is a transverse sectional view through alower portion of the injector pump.

Figure 7 is a fragmentary vertical sectional -view illustrating certain details hereinafter more fully referred to.

Figure 8 is a vertical sectional view through a valve member.

1 Figur 9 is a transverse sectional view taken substantially on the line Ill-l0 of Figure 9.

The pump 39 as clearly shown in Figure 1 comprises a drum or casing 40 which intermeof the engine block (not shown).

be seen that the pump cylinder or casing 39 is mounted perpendicularly and in a manner tobe rotated either tothe right or left as and for the purpose hereinaftermade manifest.

` For the casing 39 there is provided plate 46 bolted or otherwise secured to the casing as at- 41. k The bottom plate 46 is equipped with a bearing 48,'washer 49, and gland nut 50 50 to accommodate a shaft 5I which is adapted to have one end thereof connected with a suitable driving part of the internal combustion engine so as to cause the shaft 5I to rotate relative to the casing 39. On the inner end thereof the enen 511e pre-f It Will thus a bottom vided with an enlarged head 52 that rests on ball bearings 53. Secured against movement within the pump casing 39 and confined within saidV casing between an internal shoulder 54 and a liner sleeve 55 as shown in Figure 1 is a relatively thick guide plate 56 that is provided, in the present instance, with four openings 51 therethrough. Arranged in each opening 51 ,is a roller assembly which consists of a substantially cylindrical body member 58 provided with a-shoulder 59 that cooperates with a shoulder 60 internally of .the opening 51 adjacent the lower end of the `opening tolimit downward movement of the body member 58. The body member 58 is also provided with a slot that accommodates a roller 66 journaled on a suitable screw or the like 6I. Also threaded in the vupper end of the body member 58 is a tappet member 62 that is secured at the desired adjustment through the medium of a lock nut 63.

Also atiits upper end the casing 3911s provided with a substantially solid web 64 which in the present instance is provided with four bores 65. Associated with each bore 65 is a pump unit, there being one pump unit for each power cylinder 6. Each pump unit consists of a cylinder 66 having a snug fit within the bore 65 and a plunger orV piston 61 having a snug Working t in the cylinder 65. l

'Ihere is also one roller and tappet assembly for each of the aforementioned pump units and the piston or plunger 61 of each pump unit is provided at its lower end with a rod 68 on the lower end of which is a head 69 adapted to be engaged by its tappet 62. Also on said lower end of the piston or plunger rod 69 is a washer 19 against which 'bears one end of a spring 1| that serves to urge the head 69 into engagement with its tappet 62. 'Ihe washer 10 also is adapted to abut the member 56 for limiting the downward movement of a piston or plunger member 61.

yFor operating the piston plungers 61 in succession through the tappets 62 there is provided a cam bar 1l that has a working fit in an arcuate groove 12 provided therefor in the head 52.

As clearly `shown in. Figure 4 the cam bar 1|' is provided at one end with a slot 13 andat the Also at the inner end thereof lune shaft Il i provided with a socket in which a vertical stub shaft 11 has a working iit and is normally urged upwardly through the medium of a coil spring 18. f Y

The shaft. 11 is provided on 4one side thereof with teeth 19 that cooperate with teeth 80 on the adjacent en'd of the shaft 15 for rotating the shaft 15 incidental to a vertical movement of the shaft 1 1 and thereby effect an adjustment of the cam 1|.

On the upper end thereof the shaft 11 is pro-l vided with a separable section 11a resting on ball bearings 8| thus permitting the shaft 11 to rotate with the shaft 5|, rshaft 1J being provided with vertical ways 82 to accommodate-vertical keys-83 provided internally of the shaft` 5|. y

Also the upper end of `the shaft 11 is received within a socket 84 provided in the lower end of a pin 85, the upper end of which is threaded into the web 64 as at 86.

At opposite sides of the socket 84 pin 85 is provided with slots l81, and at the upper end of the socket the pin 85 is provided with a groove complemental to a groove in the shaft section 11a. to accommodate the cam portion 88 of a slide bar 89.

'I'he bar 89 as shown in Figure 7 works through suitable openings provided therefor in the casing 39 and in the fixed guide member 56, and is normally urged in one direction through the medium of a suitably provided spring assembly 90. At its relative opposite end the bar 89 is connected with a control link 9| that may be operated from the'body of the automobile by the operator for shifting the bar 89 to, for example, cause the shaft 11`to move downwardly.L This downward movement of the shaft would of course through the medium of the engaging teeth 19 and 80 cause the shaft 15 to rotate.- 'I'his rotative movement of the shaft 15 would through the'medium of the engaging teeth 16 and 14 cause the cam member 1I to be shifted so that a selected portion of the hump of the cam member 1| would be brought into engagement with the successive rollers 60 as found desirable for adjusting the strokes of the pump pistons |i1.L

For the pump casing 39 there is also provided a cap 92 bolted or otherwise secured to the casing as at 93.

'I'he cap 92 is drilled to accommodate for each of the individual pumping elements a valve assembly 94. i

Each valve assembly 94 includes a valve casing 95 tapped into the cap 92, and a valve guide and seat 96 that has an apertured portion fitting within the lower end of the casing 95 to accommodate the stern- 91 of a valve element 98 that is normally urged to seat upon the seat 96 through the medium of a coil spring 99. 4

Suitably coupled with the upper end of the valve casing 95 as at |00 is one end of a conduit |0| which leads to and is, atone end, tapped into the casing 'I3 of the inlet'valve assembly provided for -a power cylinder. In this connection it will be understood that in the present instance there are shown four pump assemblies one for each inlet valve assembly and there being in turn one valve assembly for each power cylinder 6, the internal combustion engine, in the presentinstance being illustrated as having four power cylinders.

The web 64 is also hollowed out to provide centrally thereof a fuel chamber or reservoir |82 to which fuel is passed from a suitable source of supply through the medium of a fuel conduit shaft 5|, driven in any manner found desirable or expedient, rotates, head 52 rotates therewith causing the ycam bar 1| to engage the rollers 60 of the roller assemblies successively.

As the cam bar 1| engages the roller 60 of each combination roller and tappet assembly said roller and tappet assembly is caused to move upwardly to engage the tappet 62 thereof with the head of the piston stem 68 causing the piston 61 to move upwardly. As'each piston 61 moves upwardly it forces the fuel previously drawninto the cylinder 65 from the reservoir |02 through the valve assembly 94, the conduit 0| and the associated intake valve assembly 1 into the combustion chamber of the power cylinder 6 as is thoughty to be apparent. Obviously as the cam bar 1| moves out of engagement with a roller 60 to engage the next succeeding roller, the first mentioned roller and tappet valve assemblyunder action of spring 1| moves downwardly causing the piston 61 to move downwardly. As piston 61 moves downwardly below the inlet |06, fuel is drawn into said cylinder from the reservoir |02. I I

Also for venting the fuel passage or chamber 22 in each valve casing I3 there is provided a suitable vent plug |01.

Also for shifting or adjusting the cam member 1| so that thesame will be brought into engagement with the successive rollers 60 Vfor adjusting the timing of the pump pistons 61 pump casing 39 is rotated about its vertical axis and relative to head 52. To this end there is provided an eccentric member a, operating in a slot b in fiange 4| as shown in Figure 1.l Eccentric a is mounted on a shaft e `equipped with a crank d to which is connected an operating link e.

It will thus be seen that either a direct manual adjustmentof cam 1| or a remote controlling of the adjustment of cam 1| may be effected to advance or retard the time of contact between cam 1| and the successive tappet assemblies58 to the end that the injection of the fuel to the power cylinders may be changed fromtime to l.

'groove in the surface thereof, a cam member slidably mounted in the groove and engageablewith the plunger to actuate the same, a rack and/ pinion mechanism for slidably actuating the cam member in the groove to regulate the stroke of the plunger and means operable outwardly Vof the pump for actuating the rack and pinion.

2. An adjustable cam for the delivery plunger of afuel pump comprising a rotatable cam carrier having an inclined groove therein. a cam member slidably mounted in the groove and er1-l gegeable with the plunger to actuate the seme,

a rack on the cam member, a shaft journaled in the carrier, a pinion on the shaft operatively engaged with the rack for slidably adjusting the cam member in the groove to regulate the stroke of the plunger, a shaft slidably mounted in the carrier and movable ailniallyv thereof, gear segments `operatively connecting said shafts and means operable outwardly of the pump for slidably actuating said last named shaft.

3. An adjustable cam for the delivery plunger of a fuel pump comprising a rotatable cam carrier having an inclined groove therein, a cam 15 .member slidably mounted in the groove and' engageable with the plunger to actuate the same, a. rack on the cam member,a shaft journaled in the carrier, a pinion on the shaft operatively engaged with the rack for slidably adjusting the cam member in the groove to regulate the stroke of the plunger, a shaft slidably mounted in the carrier and movable axially thereof, gear segments operatively connecting said shafts, a manually operated slidably mountedvrod projecting fromthe pump and positioned transversely with respect to said slidable shaft and cammlng means between the rod and said slidable shaft to actuate the latter.

ERT MENTELE. 

